Below is a list of breakthroughs in energy metabolism in living systems. Which is the correct order in which they are thought to have evolved?
A. H2O-splitting enzyme activity
B. light-dependent transfer of electrons from H2S to NADPH
C. the consumption of fermentable organic acids
D. oxygen-dependent ATP synthesis
(a) A, C, D, B
(b) C, A, B, D
(c) B, C, A, D
(d) C, B, A, D
(d)
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Microbial life has been identified at depths of 3 km despite being anoxic
Indicate whether the statement is true or false.
A lesion in which brain center is most likely to lead to a coma or even death?
a. occipital cortex b. frontal cortex c. hypothalamus d. brain stem e. spinal cord
In Jacob and Monad’s analysis of mutant E. coli strains in their study of the lac operon, the absence of the ?-
galactosidase enzyme, but presence of the lactose permease and galactosidase transacetylase enzymes, indicated that the mutation occurred in the _____ of the lac operon. a. regulatory region b. lacZ gene c. lacA gene d. lacY gene e. heterochromatin
The segmental arrangement of spinal nerves exiting the spinal column produces specific patterns of dermatomes (sensory distribution) and myotomes (motor distribution), which are very useful in clinical examination.
a. true b. false